Fix fix test_framework_loaded fails on ruby-2.x

test_objc.bundle linking AddressBook.framework, then OSX.ns_import_all
let to load AddressBook by NSClassFromString().
we'll use other framework for testing whether the framework is loaded
or not.

git-svn-id: https://svn.code.sf.net/p/rubycocoa/svn/trunk/src@2543 f4f36d40-9719-0410-9868-dde021a23eda